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<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
  background-color: lightblue;
  border: solid black 1px;
  animation: mymove 5s infinite;
}
.redDiv {
  background-color: rgb(239, 135, 88);
  text-align: center;
}
@keyframes mymove {
  50% {margin-block-start: 50px;}
}
</style>
</head>
<body>
<h1>Animation of margin-block-start</h1>
<p>Gradually change the margin-block-start from 0px to 50px, and back to 0px:<p>
<div class="redDiv">div</div>
<div id="myDIV">
This is my DIV element.
</div>
<div class="redDiv">div</div>
</body>
</html>